Measure from your C7 vertebrae (the one that sticks out from your neck) down your back in a straight line to the same level as the top of your hip bones. If you're between sizes, it is better to go with the smaller of the two sizes.

Hipbelt Sizing

Men's

Small

Medium

Large

27 - 32in(67 - 80cm)

32 - 37in(81 - 94cm)

37 - 42in(92 - 105cm)

Women's

Small

Medium

Large

25 - 30in(63 - 76cm)

27 - 32in(76 - 88cm)

30 - 35in(88 - 101cm)

Hipbelt Sizing:

These sizes are based upon a measurement 2" (5cm) below the top of the hipbone resulting in 2.5 - 7.5in (6 - 9cm) of separation at the belt front.

What are the dimensions for this bag...

What are the dimensions for this bag (heightxweightxdepth)? I'm travelling for a month in China and Tibet but I'm limited to bringing one carry-on and I need to know if this will meet the size requirement. Thanks.